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SMTnet Express, October 20, 2016, Subscribers: 26,525, Companies: 15,001, Users: 41,289

Technical Library

Analysis of Laminate Material Properties for Correlation to Pad Cratering

Carlos Morillo, Yan Ning, Michael H. Azarian, Julie Silk, Michael Pecht.; CALCE

Pad cratering failure has emerged due to the transition from traditional SnPb to SnAgCu alloys in soldering of printed circuit assemblies. Pb-free-compatible laminate materials in the printed circuit board tend to fracture under ball grid array pads when subjected to high strain mechanical loads.

In this study, two Pb-free-compatible laminates were tested, plus one dicycure non-Pb-free-compatible as control. One set of these samples were as-received and another was subjected to five reflows. It is assumed that mechanical properties of different materials have an influence on the susceptibility of laminates to fracture. However, the pad cratering phenomenon occurs at the layer of resin between the exterior copper and the first glass in the weave. Bulk mechanical properties have not been a good indicator of pad crater susceptibility.

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Forum search results for related keywords: laminate material, pad cratering.

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PCB ASSEMBLY EQUIPMENT

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CLEANING EQUIPMENT & MATERIALS

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TEST & INSPECTION EQUIPMENT

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Virtual Industries

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SMT / PCB Equipment Auctions

Online Exchange Auction - Featuring Items From Sypris Electronics

October 24 - 27 | Baja-Bid

ETM Exchange Auction Featuring Major Wireless Telecom Research Lab Equipment

November 1 - 3 | X-Line Asset Management

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Events Calendar

LED Assembly, Reliability & Testing Symposium

Conference | December 1 | SMTA

Conformal Coating - Troubleshooting Free Webinar

Online Webinar | October 27 | BEST Inc.

Printed Circuit & IPC APEX South China Fair 2016

Trade Show/Exhibition, Conference | December 7 - 9 | IPC

Career Center

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Industry Associations Events

SMTA

SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore

Event: SMTA-IPC High Reliability Cleaning & Conformal Coating Conference - Oct 25 - 27

IPC

IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Event: IPC Technical Education - November 2

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard

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Used PCB Assembly Equipment - CE Exchange

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Why Use Plasma Treatment Prior To Conformal Coating. Download the 'The Effects of Plasma Treatment Prior to Conformal Coating' White Paper.

HANDY series Automatic soldering robots - 1 Click SMT

Soldertools.net - Rework Tools

DS Series large board dispensers - GPD Global

SMT, PTH, AOI & Test Equipment

Software for PCB Manufacturing - Unisoft

KIC - Making Reflow Ovens Smarter

MIRTEC MV 6 OMNI High-Speed / High-Performance 3D AOI MACHINE.

Used SMT Equipment - IBE

PCB Cleaning products - Zestron

QWIKTRAY - custom component handling matrix tray - Count on Tools

NEW Essemtec Fox can have up to 180 feeder lanes, needs only 1sqm of floor space and can accept PCB's of up to 406 x 305 mm.

Speedprint SP700avi inline SMT screen printer

Vacuum Tweezers - pick up small components with ease

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